WordWeb Online

1. (of a liquid) agitated vigorously; in a state of turbulence
   "the river's roiling current";
   - churning, roiled, roily, turbulent

1. Be agitated
   "the sea was roiling in the storm";
   - churn, boil, moil [N. Amer]
    
2. Make turbid by stirring up the sediments of
   - rile

See also: agitated

Type of: agitate, commove, disturb, move, raise up, shake up, stir up, vex